I am a long time fan of ROTK 11. I just loved the battle system and the world map in which you could conquer. However, the game becomes very easy once you figure it out, even on the highest difficulty. Thus, I have been wondering if there were mods to this game to increase the difficulty or give it a refreshing change. I've been searching around and I have found some posts alluding to a custom scenario editor and other interesting mods. Is this true? Is there a simple way to change the game to add replayability? If so, could you please kindly show me how? I am a bit lost when it comes to modding a game, I would truly appreciate your help. Thank you.

You can check out either Zetta's scenario randomizer or the X Series thread on here if all you want is something different. There are also some custom scenarios based on the Japanese edition of the game and so forth which may be of interest.

But the only way to really get a more challenging playing experience is to self-impose your own limitations; e.g., no "active" recruiting (you can only hire those who request to serve you basically), start as a poor force, no diplomacy, etc.